Abstract
We study the temperature dependence of the single particle spectral function as well as the dynamical spin and charge structure factors for the one-dimensional Hubbard model using the finite temperature auxiliary field quantum Monte Carlo algorithm. The parameters of our simulations are chosen so to at best describe the low temperature photoemission spectra of the organic conductor tetrathiafulvalene-tetracyanoquinodimethan (TTF-TCNQ). Defining a magnetic energy scale , which marks the onset of short ranged magnetic fluctuations, we conclude that for temperatures the ground state features of the single particle spectral function are apparent in the finite temperature data. Above spectral weight transfer over a scale set by the hopping is observed. In contrast, photoemission data point to a lower energy scale below which the spectral weight transfer occurs. Discrepancies between Hubbard model calculations and experiments are discussed.
- Received 25 January 2006
DOI:https://doi.org/10.1103/PhysRevB.73.165119
©2006 American Physical Society